feat: nextTick instead of setImmediate, and fix sync in async (#136)

* fix: avoid sync callback in async function

* chore: fix linting

* chore: remove non jenkins ci

* refactor: use nextTick over setImmediate

* refactor: async/nextTick for better browser support

benchmarks/ephemeral-keys.js

@@ -25,4 +25,4 @@ curves.forEach((curve) => {
 
 suite
   .on('cycle', (event) => console.log(String(event.target)))
-  .run({async: true})
+  .run({ async: true })